#!/usr/bin/env node

'use strict';

/*!
 * Script to generate SRI hashes for use in our docs.
 * Remember to use the same vendor files as the CDN ones,
 * otherwise the hashes won't match!
 *
 * Copyright 2017-2019 The Bootstrap Authors
 * Copyright 2017-2019 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 */

var crypto = require('crypto');
var fs = require('fs');
var path = require('path');
var replace = require('replace-in-file');

var configFile = path.join(__dirname, '../_config.yml');

// Array of objects which holds the files to generate SRI hashes for.
// `file` is the path from the root folder
// `configPropertyName` is the _config.yml variable's name of the file
var files = [
    {
        file: 'dist/css/bootstrap.min.css',
        configPropertyName: 'css_hash'
    },
    {
        file: 'dist/css/bootstrap-theme.min.css',
        configPropertyName: 'css_theme_hash'
    },
    {
        file: 'dist/js/bootstrap.min.js',
        configPropertyName: 'js_hash'
    }
];

files.forEach(function (file) {
    fs.readFile(file.file, 'utf8', function (err, data) {
        if (err) {
            throw err;
        }

        var algo = 'sha384';
        var hash = crypto.createHash(algo).update(data, 'utf8').digest('base64');
        var integrity = algo + '-' + hash;

        console.log(file.configPropertyName + ': ' + integrity);

        try {
            replace.sync({
                files: configFile,
                from: new RegExp('(\\s' + file.configPropertyName + ':\\s+"|\')(\\S+)("|\')'),
                to: '$1' + integrity + '$3'
            });
        } catch (error) {
            console.error('Error occurred:', error);
        }
    });
});
